Aqueous aerosol SOA formation: impact on aerosol physical properties

Woo, Joseph L.; Kim, Derek D.; Schwier, A. N.; Li, Ruizhi; McNeill, V. Faye

doi:10.1039/c3fd00032j

Cited by 58 publications

(63 citation statements)

References 49 publications

(92 reference statements)

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“…Smog chamber experiments indicate that BrC from biomass burning depends mainly on burn conditions, and can be parameterized as a function of BC to organic aerosol ratios (Saleh et al, 2014). Woo et al (2013) suggest that secondary BrC forms through aqueous chemistry in aerosol and cloud droplets. X. used AERONET AAOD (aerosol absorption optical depth) and in situ observations to conclude that BrC absorption has been incorrectly attributed to BC, and that BrC contributes an RF of +0.11 W m −2 .…”

Section: Black Carbon (Bc)mentioning

confidence: 99%

Air Quality and Climate Connections

Fiore

Naik

Leibensperger

2015

Journal of the Air & Waste Management Association

399

292

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Multiple linkages connect air quality and climate change. Many air pollutant sources also emit carbon dioxide (CO 2 ), the dominant anthropogenic greenhouse gas (GHG). The two main contributors to non-attainment of U.S. ambient air quality standards, ozone (O 3 ) and particulate matter (PM), interact with radiation, forcing climate change. PM warms by absorbing sunlight (e.g., black carbon) or cools by scattering sunlight (e.g., sulfates) and interacts with clouds; these radiative and microphysical interactions can induce changes in precipitation and regional circulation patterns. Climate change is expected to degrade air quality in many polluted regions by changing air pollution meteorology (ventilation and dilution), precipitation and other removal processes, and by triggering some amplifying responses in atmospheric chemistry and in anthropogenic and natural sources. Together, these processes shape distributions and extreme episodes of O 3 and PM. Global modeling indicates that as air pollution programs reduce SO 2 to meet health and other air quality goals, near-term warming accelerates due to "unmasking" of warming induced by rising CO 2 . Air pollutant controls on CH 4 , a potent GHG and precursor to global O 3 levels, and on sources with high black carbon (BC) to organic carbon (OC) ratios could offset near-term warming induced by SO 2 emission reductions, while reducing global background O 3 and regionally high levels of PM. Lowering peak warming requires decreasing atmospheric CO 2 , which for some source categories would also reduce co-emitted air pollutants or their precursors. Model projections for alternative climate and air quality scenarios indicate a wide range for U.S. surface O 3 and fine PM, although regional projections may be confounded by interannual to decadal natural climate variability. Continued implementation of U.S. NO x emission controls guards against rising pollution levels triggered either by climate change or by global emission growth. Improved accuracy and trends in emission inventories are critical for accountability analyses of historical and projected air pollution and climate mitigation policies.Implications: The expansion of U.S. air pollution policy to protect climate provides an opportunity for joint mitigation, with CH 4 a prime target. BC reductions in developing nations would lower the global health burden, and for BC-rich sources (e.g., diesel) may lessen warming. Controls on these emissions could offset near-term warming induced by health-motivated reductions of sulfate (cooling). Wildfires, dust, and other natural PM and O 3 sources may increase with climate warming, posing challenges to implementing and attaining air quality standards. Accountability analyses for recent and projected air pollution and climate control strategies should underpin estimated benefits and trade-offs of future policies.

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Section: Black Carbon (Bc)mentioning

confidence: 99%

Air Quality and Climate Connections

Fiore

Naik

Leibensperger

2015

Journal of the Air & Waste Management Association

399

292

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“…A previously reported study effectively modelled predictions of the diurnal variation in 179 secondary NOCs, produced by mixed carbonyls and ammonium (Woo et al, 2013). In the 180 present study, the Nfs of ammonium-containing particles internally mixed with NOCs, 181 varied within a wider range (~40-90%) ( Fig.…”

mentioning

confidence: 62%

High secondary formation of nitrogen-containing organics (NOCs) and its possible link to oxidized organics and ammonium

Zhang¹,

Lian²,

Fu³

et al. 2019

Preprint

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Highlights 19 Nitrogen-containing organics (NOCs) were highly internally mixed with photochemically 20 produced secondary oxidized organics 21  More than 50% of NOCs were well predicted by secondary formation from these 22 oxidized organics and ammonium 23  Higher relative humidity and particle acidity facilitated the formation of NOCs 24 2 Abstract 25Nitrogen-containing organic compounds (NOCs) substantially contribute to light 26 absorbing organic aerosols, although the atmospheric processes responsible for the secondary 27 formation of these compounds are poorly understood. In this study, seasonal atmospheric 28 processing of NOCs were investigated by single particle mass spectrometry in urban 29Guangzhou from 2013-2014. The relative abundance of NOCs was found to be strongly 30 enhanced by internal mixing with the photochemically produced secondary oxidized organics 31 (such as formate, acetate, pyruvate, methylglyoxal, glyoxylate, oxalate, malonate and 32 succinate). Furthermore, the co-occurrence of NOCs with ammonium was also observed. 33Interestingly, the relative abundance of NOCs was inversely correlated with ammonium, while 34 their number fractions were positively correlated. Multiple linear regression analysis and 35 positive matrix factorization analysis were performed to predict the relative abundance of NOCs 36 generated from oxidized organics and ammonium. Both results showed close associations (R 2 > 37 0.7, p < 0.01) between the predicted NOCs and the observed values. Increased humidity and 38 higher particle acidity were found to promote the production of NOCs. Higher relative 39 contributions of NOCs were observed in summer and autumn, in comparison to spring and 40 winter, due to the relatively higher contribution of oxidized organics and NH3/NH + 4 in summer 41 and autumn periods. To the best of our knowledge, this is the first direct field observation study 42 establishing a close association between NOCs and both oxidized organics and ammonium. 43These findings have substantial implications on the role of ammonium in the atmosphere, 44 particularly in models predicting the evolution and deposition of NOCs. 45 3 https://doi.

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“…Overall, the dilution of enhanced SOA from FF-comb source in addition to that from BBEs, can explain the weak linear dependency of b abs-365 and WSOC during daytime. Or, it could be also due to photobleaching of absorbing BrC during daytime under high NO x conditions (Lee et al, 2014;Woo et al, 2013;Zhao et al, 2015).…”

Section: Temporal Variabilitymentioning

confidence: 97%